The American Federation of Musicians is gathering signatures on a petition to urge Congress to adopt uniform rules for musicians to carry on or check their instruments aboard U.S. planes.
To view the bill as currently written, go to http://www.opencongress.org/bill/111-s1451/text.
Section 713 “Transporting Musical Instruments” a.(3) provides for instruments too large to be carried into the cabin to be checked without additional charge (!), maximum combined linear measurements 150 inches, and maximum weight 165 pounds. You’ll have to sign in and create an account in order to sign the petition.

[via doublebassblog.org,  International Society of Bassists]